Pilot-valve-steered slide valve



Feb. 17, 1931-. E. TORRE PIILOT VALVE STEERED SLIDE VALVE Filed March 20. 1930 ull/11111111111 vll Patented Feb. 17, 1931 Y 1,792,665 v ,@UnlTEn srlxias :PATENT A ori-1GB EGIDIO TORRE, GENOA, ITALY rILonvALvE-srnnnnn SLIDE VALVE Application ilegd March 20, 1930, Serial No. 43`7,V507,\a11`d inv Italy January 11, 1930.

This invention relates to pilot-valve steered C, while whenrit isin its upper position puts slide valves, which providesv` an arrangement into communication S with E, and in its lower adapted for use on any slide valve device, in *posit-ion establishes the communication bewhich the main valve displacements are in tween Sand C; A relation with the displacements of a pilot Asmall amount.ofwaterunder pressure isv 55 valve controlled by a float or other control.v constantly vvfed throughv E, adjacent chamber The main object'ofthe invention is to pro- J and pipe O to, a hand-operated bypass vide a device ot the kind referred to, whichl rvalve K through which it is lied to pipes M is of reduced volume and weight and in which and N; leading to narrow calibrated passages the maximum angular displacement of the Fand Fpopening respectively into the upper s0 pilot-steering lever is maintained` within va and lower ends of said valve bodyV A'. small angle, while permitting a suitably long l @Within valve V ythe pilot valve housing stroke of the slide valve by maintaining at .B is iitted having three'V sets of openings '1,

, the same time` the control lever very short, 2 and 3, bored at different heights and of 15, these results being attained by mounting the which the upper and lowerones, 2;and 3 65 said lever on a pair of slidable stems permitrespectively open into the` upper Vand lower ting this lever to rest substantially horizontal slide valve chamber,.while the -middlerones l at different heights, by way of its ability toopen into a .space U in communication with exchange alternatively with one another the vnozzle C and'therefore with the condenser.

fulcrum andthe resistance lpoints from one Within this valve body B the sliding pilot 70 `endl to the opposite one. valve D is mounted, preferably formed as Another object ofthe invention is toproclearly shown and which in its middle povide a device of the above character in which sition Vcloses `the communication oi the conthe control lever is afloat lever, the whole dedenser with the upper and lower chamber of vice being of low cost and of simple and mainfvalve bodyA, while in its upper and 75 .i ruggedconstruction,` ensuring a reliable servlowervpositio'ns establishes the communication ice under rough working conditions while of the condenser with the upper and lower Y avoiding the costly precision ffin'ishings of valve'body A chambers respectively.V

the slidable parts. z 4The float casing or chamber H is tightly 3,0,1 i An embodiment ofthe invention fitted to fitted to valve body A and is arranged in cor- 50 a closed-cycle'iwater feed orsteamfboilers is respondence of the mean water level of the illustrated in the annexed drawing,in which: condenser, to the upper ,andrlower part Vof Y Figure l shows .a pilot-steeredloat-conwhichy it is connected through Z and Z trolledfeed distributing valve embodying the f respectively and thus-thel water within cham- Y invention, and a berH is at level ywith the condenser water. 35

Figures 2, 34 and l show detailsof construc- Float G is integral of lever L, forked at tion and tting of the controlflever (floatits end opposite tothe float, asshown Figure i lever) to the stems connected to the main andV vgfor receiving the smoothed end portions of to the pilot valve, respectively.V e a valvestems I and P.; .1 49p The feed control comprises the usual slide ,r Lever L is pivoted at `X to stem I and it 90 .valve body A 'litted with three flanged noz- 'terminatesfurther with an horizontally slot- .zles E, S and Cto whichfthe pipes are con! f ted or double-forked head Y receiving the nected leading to the delivery side of the sucA pivot member X fastened to valve stem P. tion pump from the condenser, to the hot The particular construction of lever L and its water well-and tothe condenserlrespectively; connection with stems I and P are clearly 95 4VVithin this valve body the'distributingV shown. Figures 2, 3 and ,4, l ,l slide valve (or, vin the present instance, a pis- V In the present instance or generally inthe t0n valve) V is mounted, whichin its middle -case 'of a piston valve, the upper` portion of position, as shown, closes the communication stem P terminateswith an annularly grooved between any two'of the three nozzles'E, S, `head W`positively connected to valve V 100 lil through an annular rib formed within the lower part of said valve V. The upper end of stem I is somewhat loosely connected to pilot valve B.

The operation is as follows: Assuming the float G to be in its middle position and lever L to be substantially horizontal viz. in the position in which valves V and Bare in their middle position, the device remains inoperative, but as soon as the water level in the condenser rises by way of a refuse of' water by the boiler, the water within chamber H raises the float Gr and valve D is pushed upwardly uncovering ports 2` and" thus establishing lthe communication between the port C (which, `as said, is connected to theconden'ser) andthe upper piston valve chamber, and thus va'lve V is sucked up by the vacuum in the condenser and in addition is pushed up by the pressure water forced through port F. Valve by sliding upwardly causes the pilot valve body B to slide upon valve Dv until complete closure ofports 2. In this moment lever L is again substantially horizontal but l in a higher position than the former one.

As it is apparent, the fulcrum of lever l. is at XT when the pivot valve is directly steered by the iioat, and iswithin the float when acted upon by main valve V.

t is further clear that the same operation isy repeated all times the Vwater level in the condenser rises, andwhen ports 2 are uncovered, the water from the delivery of the pump connected to E is discharged through Sr to the hot water well.

On the contray when the level in the condenser sinks the operation of the device is reversed and valve Vrbeing sucked down establishes the communication between the condenser and the hot water well from which the water', having been previously deaerated, passesto the said condenser and thence to the boiler. V

Vhen the boiler should work in a open cycle, valve V is raised by. hand by means of the screwstem R operated by hand wheel T.

From the foregoing it is also apparent that the maximum angle of oscillation of lever L is limited by an amount just suliicient to steer the pilot valve D to uncover either of the sets of ports 2er 3, the height of the pivotal connections X and X of said float lever varying by an amount Q corresponding to the total maximum stroke of the piston valve YV, and within these limits the lever L can be always brought in horizontal position whenever the equilibrium between feed and consumption is established. In this manner. it is possible to reduce the volume of the Hoat chamber and the length of the float lever, while insuring a. powerful and swift steering of the valves.

The particular connection ofthe valve stems P and I permits of a certain amount of lateral play at the points and further, in the case of a piston valve, permits a free revolution of valve V under the tangential flow of water from E to S or from S to C.

It is to be understood that the embodiment as described and shown is only one of the many possible constructions within the limits of the invention or the scope of the appended claims, and that the valvecontrolling lever might be operated also by other means, instead of a float. A

Having thus described my invention, I claim:

`l. In pilot-valve controlled slide valves, the arrangement within the slide valve of a pilot valve body, a pilot valve within this body, a slidable stem depending from the slide valve, a second slidable stem depending from the pilot valve and complementary to the first named stem and a control lever pivotally attached to both said slidable stems and having a projecting portion adapted to ne acted upon by the control means.

2. A distributing slide valve comprising a valve body, pipe connections integral of the valve body, a float chamber iitted to said valve bod i, a slide distributinfT valve within 2 said valve body, a pilot valve body integral of theslide valve having ports opening into the slide valve chambers, a pilot valve within this body adapted to establish communication between diiierent pilot valve ports and a pair of slidable stems connected to the distributing valve and to the pilot valve, respectively, a float within the float chamber, a lever attached to this {ioat and pivotally c0117 nected both to the stem of the distributingslide valve and to theA stem of the pilot valve, so as to permit the fulcrunr of the lever to pass alternatively from the end that is connected to the'distributing valve stem, to the float end.

3. A distributing slide valve according to claim l, is which the slide valve body is provided with three tubular pipe connections or ports situated at dierent' heights,- the slidei valve in its middle position intercepting the communication between the middle' port and either of the' other ports, while in its upper and lower positions establishes the communication with 'the upper or the lower port re-A spectively. y Y l 4; A distributing slide valve comprising a'valve b'ody, pipe connections at different heights of this valve body, a iioat chamber litted to said valve body, a' slide distributing. valve within said valve body, adapted to intercept the communication ofthe middle pipe connection with thel upper and the lower ones and to establish the communication in their upper and lower positions, a pressure water bypass pipe opening into upper and lower' calibrated ports within the valve body, ya hand operated valve controlling the passage of the said pressure' fluid, a pilot valve body integral of said slide valve and having ports opening into the upper and lower slide valve chambers and into the passage communicating With one of the ports in the slide valve body, a pilot valve Within this body adapted to establish the communication betvveen the middle port in the pilot valve body and either of the upper and lower ports therein and a pair of slidable stems connected to the distributing valve and to the pilot valve respectively, a float Within the float chamber, a lever attached to this float and pivotally connected both to the stem of the distributing slide-valve and to the stein I of the pilot valve, so as to permit the fulcrum of the lever to pass alternatively from the end connected to the distributing valve stem, to the oat end.

5. A distributing slide valve according to claim 2, comprising means for manually operating said valve.

6. A distributing slide valve according to claim 2, in which the distributing and pilot valves are cylindrical or piston valves and are rotatably connected to depending slidable stems to Which the float lever is pivotally attached so as to permit also a certain amount of lateral play of the parts, and a rotation of the piston valves Within their bodies and about the slidable stems.

In testimony whereof I have afixed my signature.

EGIDIO TORRE. 

